Concept explainers
Calculate the work done in lifting a 500-N barbell 2.2 m above the floor. (What is the potential energy of the barbell when it is lifted to this height?)
Work done and potential energy.
Answer to Problem 35A
Work done and potential energy will be equal to 1100 J.
Explanation of Solution
Given:
Force is given,
Barbell is lifted to a height of,
Formula used:
According to work energy theorem work done is equal to change in potential energy.
Where, W is work done and PE is potential energy.
Potential energy is given by,
Where, m is mass, g is acceleration and h is height.
Calculation:
Force is equal to,
Now, substituting the value of mg and h and solve.
Now, according to work energy theorem,
Conclusion:
Therefore, work done and potential energy will be equal to 1100 J.
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